Dometic Atwood Hydro Flame Igniter Control Board | 31501 | DC

Restore reliable ignition on your Atwood Hydro Flame DC furnace with the Dometic Atwood 31501 OEM Hydro Flame Furnace Igniter Control Board — DC. Genuine Dometic Atwood OEM replacement ignition control board — 12V DC version — for a wide range of Atwood and Dometic-branded Hydro Flame furnaces. Performs all functions necessary to turn the furnace on and keep it running, with built-in safety features including 15-second ignition delay and flame lock-out.

AC Version Instead?

If your Atwood Hydro Flame furnace is a 120V AC Park Model (rather than the standard 12V DC coach furnace), see the Dometic Atwood 30621 AFL Igniter Control Board — AC — engineered for the AFLA35/40 series Park Model furnaces.

What This Board Does

The 31501 igniter control board is the central ignition brain of the Atwood Hydro Flame DC furnace. It:

• Sends signals to open the gas valve at the correct point in the ignition cycle
• Emits high output voltage that creates an ignition spark to light the burner
• Monitors flame presence to ensure proper combustion
• Manages ignition sequence timing
• Enforces safety lock-outs on ignition failures

⭐ Safe Startup — 15-Second Ignition Delay

The board incorporates a 15-second ignition delay designed to purge any unburned gas from the combustion chamber before attempting ignition. This delay ensures a safer and more reliable ignition — eliminating the risks associated with gas buildup that could cause hazardous conditions.

⭐ Ignition Failure Lock-Out

The board features a lock-out safety feature that engages if either:

• Spark generation fails to occur during the ignition cycle
• The gas valve fails to open during the ignition cycle

This proactive safety feature halts further ignition attempts, providing an additional layer of security to prevent hazardous situations such as gas leaks or explosions.

⭐ Continuous Flame Monitoring

During operation, the board continuously monitors the presence and quality of the flame in the combustion chamber. Micro-amp sensing capabilities integrated with the electrode ensure the furnace operates under optimal and safe conditions. As long as the board detects the minimum required micro-amps from the electrode, it maintains uninterrupted heating without entering lock-out mode.

Compatible Atwood/Dometic Furnaces

Extensive compatibility across the Atwood Hydro Flame DC furnace lineup:

Atwood Hydro Flame Series:

• 7912-II, 7916-II, 7920-II
• 8012-II
• FA7912D, FA7916D, FA7920D
• HF8012D
• DC8225, DC8232, DC8235, DC8241
• FA76D, FA7615D
• FA7825, FA7832
• FA72

8500 and 8900 Series:

• 8500-IV Series, 8500-III Series, 8500-II Series, 8500-I Series
• 8900-IDC Series, 8900-IIDC Series, 8900-IIIDC Series

AFSD, AFMD, DFMD, DFSD Series:

• AFSD12 Series, AFSD16 Series, AFSD20 Series
• AFMD20 Series, AFMD25 Series, AFMD30 Series, AFMD35 Series
• DFMD20111, DFMD25111, DFMD30111, DFMD35111
• DFSD12111, DFSD16111, DFSD20111

2-Stage Atwood Furnace Instead?

For Atwood 2-stage furnaces (models 1522, 2334, 2540), see the Dometic 34109 Ignition Control Circuit Board — engineered specifically for 2-stage furnace applications.

Related Dometic Furnaces

If you're servicing a DFSD-series furnace, see:

• Dometic DFSD20111 18K BTU Furnace — full-door 18K furnace
• Dometic DFSD20121 18K BTU Furnace — half-door/cover configuration

Physical and Electrical Specifications

• Power Source: 12V DC
• Dimensions: 4-1/4" × 3-1/4"

Cross-Reference Part Numbers

• Part Number: 31501

⚠️ Professional Installation Required

Installation involves 12V DC electrical wiring, gas system integration, and ignition system connections. Because of the safety-critical nature of furnace ignition control components, installation should be performed by a qualified RV service technician. Improper installation can result in gas leaks, ignition failures, or fire/explosion hazards.

Limited 1-Year Manufacturer Warranty

Genuine Dometic Atwood OEM

Key Features

• Genuine Dometic Atwood OEM Hydro Flame igniter control board
• Part number: 31501
• 12V DC power source
• Broad Hydro Flame compatibility: Atwood 7912/7916/7920/8012, FA-series, DC-series, 8500 series, 8900 series, AFSD, AFMD, DFMD, DFSD series
• AC (120V) Park Model sibling available: Dometic Atwood 30621 (AFL AC version)
• 15-second ignition delay — purges unburned gas from combustion chamber
• Ignition failure lock-out — halts attempts if spark or gas valve fails
• Continuous flame monitoring via micro-amp sensing
• Dimensions: 4-1/4" × 3-1/4"
• Backed by limited 1-year manufacturer warranty

Specifications

• Brand: Dometic (Atwood)
• Series: Hydro Flame
• Part Number: 31501
• Type: Furnace Igniter Control Board
• Power Source: 12V DC
• Compatible Atwood/Dometic Furnace Models: 7912-II, 7916-II, 7920-II, 8012-II, FA7912D, FA7916D, FA7920D, HF8012D, DC8225, DC8232, DC8235, DC8241, FA76D, FA7615D, FA7825, FA7832, FA72, 8500-IV/III/II/I Series, 8900-IDC/IIDC/IIIDC Series, AFSD12/16/20 Series, AFMD20/25/30/35 Series, DFMD20111/25111/30111/35111, DFSD12111/16111/20111
• Ignition Delay: 15 seconds (gas purge)
• Safety Features: Ignition failure lock-out, continuous flame monitoring, micro-amp sensing
• Dimensions: 4-1/4" × 3-1/4"
• AC (120V) Park Model Sibling: Dometic Atwood 30621 (AFL AC)
• Warranty: Limited 1-year manufacturer warranty